65280240 has 120 divisors (see below), whose sum is σ = 222494688. Its totient is φ = 17149440.

The previous prime is 65280223. The next prime is 65280251. The reversal of 65280240 is 4208256.

65280240 is a `hidden beast` number, since 652 + 8 + 0 + 2 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50482 + ... + 51758.

Almost surely, 2^65280240 is an apocalyptic number.

65280240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65280240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111247344).

65280240 is an abundant number, since it is smaller than the sum of its proper divisors (157214448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65280240 is a wasteful number, since it uses less digits than its factorization.

65280240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1367 (or 1358 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 65280240 is about 8079.6188028892. The cubic root of 65280240 is about 402.6495772659.

Adding to 65280240 its reverse (4208256), we get a palindrome (69488496).

The spelling of 65280240 in words is "sixty-five million, two hundred eighty thousand, two hundred forty".